Doweling device.



PATENTED NOV. 21, 1905.

H. A. LITZ. DOWELING DEVICE. APPLICATION 31m) 001 26. 1904.

Witneooeo UNITED STATES PATENT OFFICE.

DOWELING DEVICE.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed October 26, 190 Serial No. 230,051.

To (tZZ whom it may concern.-

Be it known that I, HERMAN A. LI'rz, a citizen of Switzerland, residing at Danville, in the county of Montour and State of Pennsylvania, haveinvented certain new and useful Improvements in Doweling Devices, of which the following is a specification.

The purpose of my invention is to provide an improved doweling device intended'particularly for securing blocks of wood together to form mosaics in the manner hereinafter described, but which may be used for a variety of other purposes.

In the accompanying drawings, Figure 1 is an enlarged perspective view of one of my im proved doweling devices in strip form. Fig. 2 is an enlarged plan view of a doweling device of the same design, having a single barbed head pointing in one direction and a pair of barbed heads pointing in the opposite direction. Fig. 3is a side view of the device shown in Fig. 2. Fig. 4 is an enlarged plan view of a doweling device having only two barbed heads, the said heads pointing in opposite clirections. Fig. 5 is a side view of the device shown in Fig. 4. Fig. 6 is a top perspective view of parts of a mosaic panel, partly broken away, illustrating the manner of employing the doweling device in building up mosaic panels; and Fig. 7 is an enlarged perspective view of a modified form of doweling device in strip form.

Referring to Fig. 1 of the drawings, A indicates a doweling strip or blade, which may be of any desired length and which is preferably made of sheet steel or other strong sheet metal. The body of the doweling device shown in Fig. 1 consists ofa metal strip 1, having a series of teeth a Z) 0 (Z, &c., projecting alternately in opposite directions and from the lateral edges of the body portion, said teeth having barbed heads 3. As shown, the barbs 4 project laterally from the teeth near their outer ends and the lateral edges of the heads converge to points 5. also ground off or beveled on both sides toward the points, as indicated by the numerals 6 in Fig. 3. a zigzag form, as shown, and the teeth extend alternately in opposite directions from the lateral edges of the strip at the convex portions of the latter. The contour of the The heads are In Fig. l the body portionl has strip is such that the apices 7 of the concaved portions of the strip will be in the same straight line, or nearly so.

In Figs. 2 and 3 I have shown a doweling device B, which is simply a part of a strip like the one shown in Fig. 1. In Fig. 2 asingle tooth Z) is shown at one side of the body portion 1, and two teeth a and 0 are shown at the opposite side.

In Fig. 4 I have shown a doweling device C, having a straight curved body portion 1', with barbed heads 3 pointing in opposite directions from the body portion.

In Fig. 6 I have illustrated the manner of connecting the mosaic blocks with my improved doweling devices. The method of arranging and connecting the blocks to form the panel and the panel itselfare the subject of a separate application, Serial No. 219,386, filed August 8, 1904:.

In forming a mosaic panel I arrange the blocks in strips or groups of various lengths, the adjacent blocks in each strip being connected together by one of my improved doweling devices, which is forced into the meeting faces of both blocks. The'groups of blocks are then connected in a similar manner by doweling devices, which engage several blocks in two or more adjacent groups. For connecting the individual blocks in a group together any one of the doweling devices shown in the drawings may be used, but preferably the doweling devices B, as shown in Fig. 6. For instance, the teeth a and c of one of the doweling devices B are first driven or forced into a vertical face of one block E, and another block E is then pressed against this vertical face, forcing the tooth into the second block, thus connecting the two blocks to form one group. Similarly two blocks F F are joined together by a doweling device to form another group and then the group E E is joined to the groups F F by one of the doweling devices A, whose teeth enter the four blocks in the two groups. Groups or strips having their adjacent blocks first con-' nected together by devices B are then added to the sides and ends of the previously-assembled groups until the panel is built of the required size. Thus a group G G and a group H H are added at the sides of the central groups E E and F F, and groups or strips I I, &c., J J, &c., are then connected at the ends, and groups K K, &c., L L, &c., are then added at the sides, the doweling devices A in each instance connecting several blocks in adjacent groups together and the devices B connecting the individual blocks in each group together.

The doweling devices having a zigzag body portion will in practice enter each of two adjoining blocks as far as the longitudinal central line of the body of the doweling device. It will be seen that when the doweling device, such as that shown in Fig. 1, is forced into a block the zigzag strip will form a stop to limit the inward movement of the teeth whenever the wood becomes crowded closely against the inclined sides of the strip between the teeth at the angles or apices 7. The barbs 4L prevent the doweling devices from being withdrawn, and the latter become anchored within the wood. It will also be apparent that the wood will be crowded between the barbed ends of adjacent teeth as the doweling device passes into the wood, and the wood fiber will naturally expand between the teeth after the barbs have moved inward, thus looking the doweling devices firmly in place.

For connecting individual blocks in a strip together the device shown in Fig. 5 is suitable; but the devices shown in the other figures, having more than two teeth, are more satisfactory.

In Fig. 7 I have shown a doweling device A in which the adjacent oppositely-extending portions of the body 1 of the strip are longer and arranged at a smaller angle to one another than is the case with the strip 1 in Fig. 1, and in Fig. 7 the heads 3 directly adjoin the angular portions of the strip instead of being arranged upon prongs or teeth projecting laterally from the body of the strip, as in Fig. 1. This form of doweling device requires less metal for its manufacture than the device shown in Fig. 1 and for that reason is desirable.

In the several strip doweling devices shown the barbed heads or teeth project in the plane of the strip.

WVithout limiting myself to the exact forms of doweling device shown in the drawings, what I claim, and desire to secure by Letters Patent of the United States, is-

1. A doweling device comprising a sheetmetal strip having a series of pointed prongs or teeth projecting laterally therefrom at each side in the plane of the strip, said teeth having barbs at their adjacent sides.

2. A doweling device comprising a zigzag sheet-metal strip having teeth at each side, the successive teeth projecting alternately in opposite directions from the lateral edges of the strip at its convex portions and in the plane of the strip.

3. A doweling device comprising a zigzag sheet-metal strip having teeth at each side, the successive teeth projecting alternately in opposite directions from the lateral edges of the strip at its convex portions and in the plane of the strip, said teeth having barbs.

4. A doweling device comprising a zigzag sheet-metal strip having teeth at each side, the successive teeth projecting alternately in opposite directions from the lateral edges of the strip and in the plane of the strip, said teeth having barbs at their adjacent edges.

5. A doweling device comprising a zigzag sheet-metal strip having barbed heads projecting from the lateral edges of the strip at its convex portions said barbed heads lying in the plane of the strip.

In testimony whereof I affix my signature in presence of two witnesses.

' HERMAN A. LITZ.

WVitnesses:

T. O. HARTMAN, WM. GRAY WILLIAMS. 

